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Feel fresh through every mile in the NIKE® Flex Trainer 4 women's running shoes. Fast and featherweight, they're crafted using a comfortable blend of mesh and foam for breathability and support where you need it most. The Phylon® midsole channels impact shock into energy return, and flex grooves enhance the foot's natural motion for a smooth ride.

This is a strange shoe. I bought these from Sports Authority because I couldn't find anyone else who carried the Cobalt. The shoes were the royal blue color I was looking for. They were also lightweight as the description stated.

I was tempted to keep them for the color alone. However, the shoe looks really weird on my foot. It hugs my ankle and almost makes it look swollen. The mesh on the sides isn't attached to anything in the middle so it bulges out. This could be because they became smashed in delivery and didn't have any stuffing in them, but I have a feeling they would do this over time anyway. I tried adding thicker insoles thinking the shoe was made for a thicker or wider foot (my feet are thin and narrow), but it didn't seem to help. I returned these for a refund.

Colors are fun and while it is a great looking shoe it is a very lightweight. It would be ideal for a light workout where you don't need real lateral, fore/aft support. The outsole is thin. I replaced the insoles with more of an orthodic for arch support; makes them just okay for anything strenuous but still very fun looking!